condition mean min max ZT0-3 0.465467 0.44578249999999997 0.48515150000000007 ZT4-7 0.797794 0.797794 0.797794 ZT8-11 0.8061435 0.8061435 0.8061435 ZT12-15 0 0 0 ZT16-19 0.6817789999999999 0.6817789999999999 0.6817789999999999 ZT20-23 0.588837 0.588837 0.588837